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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd31c77477b640321735933e56497b72cf80dd50a2f688419ea8a771079a818c' 
  AND token = 'Iz7/+Ta56CLmXu3zDXy4L+ng5vw3mSInIlNlb6+IXIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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