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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04dc394e1d28bdbab5db09b5bd6c4664a763f734aa64f9ac55f0d4bd246b7b9' 
  AND token = '8v4Ka55Vfdi7CF1W7EE7xBBFY4935LGH4Zy45B1aZHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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