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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed3be4b9a93ae8b8d181e0e6046f4591eb270377be355f37fa81114b0d47a22' 
  AND token = '761ayIZ0GDXFjO7cxYk3DZ0f/nW8d8jj+0kUb+SVzZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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