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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b708d3dab8f1e04ce31c1f14668ddd2a1ea9523024923e405db71071a063ba' 
  AND token = 'oGlyJ+L0OkXSiBFljkrPI2OTi+TwP8UFhoGSLU2mztg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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