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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6c19b06cc5490e01c4cc871a5260cc496efa9c81c66f05905c4a9642f044b6' 
  AND token = 'AP/g5t6AGUQrvt43B8GC29yeZmBLVP/ldU+lQeHVJeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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