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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2e5f9f37ffe00b6d867af80220c27504729cfc91bc36f5ae9b54dc8cddbf84' 
  AND token = 'eFPAcSkRrGHENWbf6bjQma7syi1GjuFNTxqEntQ/Iv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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