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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f3b8045c02e4d472bee8dd362a5e71763104960f1d1660dccea4d6926483e1' 
  AND token = 'D8/UUgPT3PAY3qqWotasrg+5KQ13tctCKXWhNLHsM64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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