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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06c61d262964d4571422b0b27bcfca7ca108826c761452417934637d52d1f5c' 
  AND token = 'XD98zGvAA0d3ddMVq9D4mFSyYg0ABeVVeFyR+MYrGi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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