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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e823e3777ba76fc7363f34b841bfd129a32ef685a22f3e81e23ec0c4c1fb7ebe' 
  AND token = 'SzSwr1cvWHi6pyB7qbAjC2hx4LhU1ZeTukuPyappnas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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