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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34fe584d30d7a0183b024d6ec91eb9d672814bea8a811f696038183ac8ef8f1' 
  AND token = '7h9BhrLumPL6VuuVJWXeRRX3t34n43sH/8Sh+HXrFGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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