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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3332cfdc51e3f872e0ceb2fb6b619fa8e154ffffab60a677a5e42bf181fcd511' 
  AND token = '5mtiZ+Wxzm0ud1bSeK9mVf0bbhSRgq3x/2WBh/J/AYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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