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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5742d21c6bcdd6b1cd38f435cc69d4b914dfb17cab9fb6849baa2e89bfd92c5' 
  AND token = 'jjiCnnTe1g1D9JLbPATqZvH4+e/v8t6cANZio0zh3rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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