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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9835508073c24daa637e4ce41f30a9c526d8f6aed4bda216e100b366340e084e' 
  AND token = '/tgiR1+A1LQN34Wrsh2bKZKQX7/rtNnnNjQz5LR8KL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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