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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ee0ae5ab932b3253e09fe1cfbe0d798c897f99dd35acca86d41b7b0ece83d0' 
  AND token = 'PW5AjbrZvnloRAYgqT4/WN6q0+dPgvPWXIJdlOttfiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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