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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e6cf17050693e3e8fcfc4a1d5112a4d97be1af0fbdfe8a96ec09056f28fd6b' 
  AND token = 'ReLoLlUDdLOhl1xOcMj/z2gz+M9lZP6jNkNw37kUAog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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