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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0750cc020cf95d45630d3d15be9b1e9bebd38cc4801a98cec157cb65f8fed4' 
  AND token = '8bY0fD3HZBQA554CH8J95waDtHiAIlq6xymfTWL6PGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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