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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5361aff0f2d5ae7a7142dd2e2ffd03fc2e7b498d05922b3959b63249ac6961f' 
  AND token = 'yvbAHQVLHAAL8NZZ+GbjZU3CdDEJh1A7SKRpAAo5bJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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