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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ea784a123a6e734a86e25c1b6928f4cf4d0343871aaa87cfb206f1f26d0741' 
  AND token = 'g5B9A8iO9w9Puljx/k9M3CxWfCvxsKc8yMUPAQI02WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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