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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ff449b11bc49af802c2e25c997a69a94f3a9ef93891b702e2d5f390a3312f8' 
  AND token = 'HOl1EIWGKA0IzycThXf9Rb4sQv759LzfpRxlc4oyQpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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