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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b701e716c13ea3bc8c47e289e4433b2e1b7768d4cb5dbe92c8cebeed7e1e1af3' 
  AND token = '8+0tuyWsbGibDzvR7juYBPc1izOx8+xIpdFKhiGaTAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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