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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb6c8db9128a7eb1b851da98a5a0a33372e871ad2e8b77e6a48c4283b1f4cef' 
  AND token = 'kA76hzlfU4kAPh+2HHrGy7hAQXRUid2GqXJqyGAYfrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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