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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7208553e3d3775b409bce456bd75b1e6f25dcd59d8a3ba5e8e7b6e4f2ff7e93' 
  AND token = 'vjfH2+/gEYhHiW9N+/MIBJR352tbsjxhYm1EwPS5Ua8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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