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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f960816fc3396c2fd2e928aa388d9eddc10284fd3f061f72e0e527d6deec7b' 
  AND token = 'e/kenDROROoeawzXeQNxNeXsqwC/QfVi6+DmIQ9DUsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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