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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74107aa513ec15fdec2f89f4a5970fb99ddc9b1dc89dc2c902dfc91d33580249' 
  AND token = 'rGCMhV6a+jVCT0oh5N44O1MpoejnhTc8YfSYTmCMYg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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