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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b53e4b5cddca2100a93b42854d35a77c0cb413b1f4f8e45a175ff19a6943d2' 
  AND token = 'A9xPXCEz5s69R25M4lNc3GRdzX5L26bnbovVPKozAjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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