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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f580c905f548201faa3e8bc04223786d937c7038dde4d0f781788fba0e040e9' 
  AND token = 'tTxaWt1OFNlycrjPV5zwq0jCglUTyHYy6sSFafmZ1/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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