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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967487fe3e48501c6d45f6cb21f32c7e8d2a9d07a5f3e43d910a0940a3e934f5' 
  AND token = '9MuiNW6XUxyDAPC4TyELajlvJ5/MOT+a9LUzXTI52ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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