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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb54d7e5c9df147519bec7745b0d9eaea9b4ef05c5491fd62425af83fa1007ed' 
  AND token = '5OqAijQ15FP6wNdCrBRuCGV9HS9WM9AZ8zdbgeROocY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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