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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1861494da83e9dfdd46846a0fef8ce23887888227768d07d0d3da9b082141ac' 
  AND token = 'lSPjEMjtX7k5vz6HzaV8HK5wkGEmeq3oxA4KWi9nC4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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