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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ccbd6ca6a9eb8e0a3805c9b7f454ab577977ce705e0180eb83a8dfa848ae78' 
  AND token = 'b8wIHhkQDL2hJumfKzSnwAlX4bvmet32aliGqWLRIZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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