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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71aeb1749f2d414da6fcb0d756216963979ac26e2a53db69e306db06b76eca7' 
  AND token = 'Amj0oQyrV8bqsOL/LgsoifObwm7zB9VsWnBf/C3hISg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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