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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c4e1f96943f800d2442962be35abbc6fc7e0904afecafd3cd772d896894554' 
  AND token = 'TEQ1+9w9ywCetvRIj2kiigAIMDb0aZlvNnI7tTuq7rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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