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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7787d7d2aee09b8d1a7b648182b317e551679572a097878f93a2399be4284b3e' 
  AND token = 'qD3S+phRkX7MxkPRDliBTICgVMRFmBE3+j1TU2ODx9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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