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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7eb6b434327bbfb3e19b211dd6c77566678bd18bbed6f8672e9dffc41a1bdd' 
  AND token = '4C/62w2uJCq/0p+IqonaZZdM2QK8aQfXH3Iv0c0YjvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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