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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6493277e826141b1a47c5f9774c06e5792e6fc81fc06ed2157517edf714c2ee' 
  AND token = 'IcG66sd1SDJqijo1jOZv7BgOdFNCNyw1mzC0cr5Ol3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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