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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5d62aad42e116f6a2d44f18a511caf48e477890f29a82a272ef33220292d3f' 
  AND token = 'tnz+cp5XfTCksRzQajyEZEJQNtcD3P3TSXdB6bXFeTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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