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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34290da1371ea1028ec4c37a5317141a3b96400e1d76d375705c47c490b1a0e' 
  AND token = 'TV3S7Z9ylsnp2tjXT5GyKDfE+A2eU1amf01rGJZ3eUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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