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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ecb7cd19963a2e89291c4dca1913f98f47cfea72c41e94eaba07b53d89c4a4' 
  AND token = 'ed7c3mEXQ86V4lsEi3GNHFgKRGvNOQqOoYKA6A2Auw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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