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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e9f6d17f7238e998621df4ea60e353ef0bb1611604f33ac70f3dc3142bba74' 
  AND token = 'Cvx+eFbUurUCe5mV+0oVsmNlaLCd03HbuEKcn1x2sjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}