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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea2dae33da03a95d374f1b6d8ef0413ba866d6fdff613fee5b86c53043635e6' 
  AND token = 'mmzi1+ECTWSq/VeS65F5F+wl0J2hG2PZlXtO7uCY8pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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