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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2acda9ec98953bfd2f38518da341293033af6aa68cfdf2b40fe669c0f3d4fe' 
  AND token = '+oLhsnLktLMe5BUbo6ZQ+IIKEjK1IyVjaGDajds7CqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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