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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1df8c5ae8f70a1f162c1e881856b4fac97ad523290244e0efa01382c373c77a' 
  AND token = 'mjWoxUHTS40nt43RUul+XeJMOl707WQZG2zqZc6jDU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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