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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc552e18499035b2975975d5a101e0816f7c2a8ca27572c4f06e57798a63411' 
  AND token = '6pmbYrPeM5z9kaQDYl/Rgs70mgMBVM2bvt58ywo934k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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