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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa1ee376dafb7bb192212ef3ba999664572460ad8ab5321137ff1601701ca33' 
  AND token = 'RFNf5odDYbtlBT1lI40WjEnOqDJQQy8+GXLqYK1ddAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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