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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb35cb8551d0a1d56aac153e7261ee7b0f2ebe6bb352a4936a0319553d187629' 
  AND token = 'z5uqcxwVHzIh0L6NRe7L9tvvxvVR6CfS0fwUmqMd9Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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