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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020bb1dc9c4327d23895acb7cb1dd36e07f831e38780cb2f614468281cac1dff' 
  AND token = 'QOFx9xb8D8mJfR3+WFpXYQN/42cRJpcj7PQKlqP2Gns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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