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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90b1e934d69424f05b4e7b2088bb4a3707730cfd7cb7d1e1961bf3905f8ded4' 
  AND token = 'DBGFK9fm90p1HQUdLN9IXUBDpcZDykKGPhuqpHW8D1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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