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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6397138987dfbeac0d4fcc437d2b4f50c1ef4444551364e4713722e0417624f' 
  AND token = '1O2DGAN4YlPT9H1gGbFANAtrLePxbxtXo5GJ9vnk+cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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