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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19365a9ce2f4ef9ac93d0fc815cbba77babeece9a2343e338a102b5a597d0f8' 
  AND token = '0VjnZU+1jfq2SZjg0OgXfqnExH3q5qpZxiQ2uH+VQSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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