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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527ba9aa43ac51fb6a90ada04dbeaef5ecda5a0983b66f6f22610376dbeb32db' 
  AND token = 'NdmSGSAFm2HVaJa9ahy9ih92HsffiIR5tl8SMDAm3Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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