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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61019ec6bb26c048b12c3612f77248ecaf25083471435267badb4fbee6610668' 
  AND token = 'c27ug0e17v2AyjyrL9eJURWMTxNT1sd/R8b2RXoEmWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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