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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee79f0d45f78dc8c8c4da7715ae2e10e5ddf3db0c3ed8c7a0cdd34b802fb3f4b' 
  AND token = '2IKBYHzx18UHjmu/+dDsCcuYEnuxEZThCfQaVJWI5bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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